Evaluation of binder solution for a lithium ion rechargeable battery by low-frequency AC impedance method

Abstract

PVDF is used as a binder in the mixture slurry of lithium-ion rechargeable batteries. More improvement of PVDF has been required along with the paradigm shift performance required for the new battery. However, a simple evaluation method of PVDF cannot be found. In this paper, to study the electrical properties of the NMP solution of PVDF, the electrical properties of the NMP solution of PVDF were investigated using the AC impedance method. As a result, it was found that the electrical properties are different in NMP solution and NMP solution of PVDF, and it is conspicuous to the impedance of the low-frequency region by the type of PVDF solution.